Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions

Si-Qi Huang; Mo Zhu; Jin-Xian Yang; Lian-Wei Li

doi:10.1007/s10118-022-2864-4

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Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions

RAPID COMMUNICATION | Updated：2022-11-16

- Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions
- Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions
- 高分子科学（英文版） 2022年40卷第12期页码：1515-1521
- Affiliations：
  
  a.College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
  b.Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  lianweili@szu.edu.cn
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 21973088) and Shenzhen Science and Technology Program (Nos. RCYX20210706092101012 and ZDSYS20210623100800001).;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-022-2864-4.
- DOI：10.1007/s10118-022-2864-4
  中图分类号：
- 收稿：2022-07-08，
  
  修回：2022-8-4，
  
  录用：2022-9-14，
  
  网络首发：2022-10-20，
  
  纸质出版：2022-12-01
- Accepted：
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Huang, S. Q.; Zhu, M.; Yang, J. X.; Li, L. W. Structural feature and internal motion of hyperbranching cluster system with low polydispersity and featured pattern in dilute solutions. Chinese J. Polym. Sci. 2022, 40, 1515–1521

Si-Qi Huang, Mo Zhu, Jin-Xian Yang, et al. Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions[J]. Chinese Journal of Polymer Science, 2022, 40(12): 1515-1521.
Huang, S. Q.; Zhu, M.; Yang, J. X.; Li, L. W. Structural feature and internal motion of hyperbranching cluster system with low polydispersity and featured pattern in dilute solutions. Chinese J. Polym. Sci. 2022, 40, 1515–1521 DOI： 10.1007/s10118-022-2864-4.

Si-Qi Huang, Mo Zhu, Jin-Xian Yang, et al. Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions[J]. Chinese Journal of Polymer Science, 2022, 40(12): 1515-1521. DOI： 10.1007/s10118-022-2864-4.

摘要

The reduced first cumulant [

(

)/(

)] for cluster dose not display an asymptotic behaviour

which differs from previously reported behavior of individual chain systems with low polydispersity feature.

Abstract

This work reports the structural feature and internal motion of one novel hyperbranching cluster system in dilution solution. The cluster system is composed of HB-PS

300

-P

hypergraft copolymer chains with uniform subchain

high molar mass and low polydispersity (

=1.73×10

g/mol and

≈1.07)

where HB-PS and P

BA represent hyperbranched polystyrene core and poly(

tert

-butyl polyacrylate) graft

respectively. In the selective solvent of PS blocks (cyclohexane

=34.5 °C)

the aggregation kinetics and structural feature are found to be precisely tunable for assembled clusters by the aggregation temperature (11 °C

17 °C) and time (0 h

24 h). An interesting structural evolution kinetics is observed

namely

the fractal dimension (

) of clusters is found to first increases and then decreases with

eventually

it reaches a plateau value of

≈3.0

corresponds to a uniform spherical structure. By using dynamic light scattering (DLS) to monitor the number and strength of relaxation modes in

(

) with

being the decay rate and

being the scattering vector

it is quantitatively revealed that the relaxation

intensity contribution and mode origin of internal motions of clusters are neither similar with previously reported cluster systems with high polydispersity

nor with the classical linear chain systems. In particular

in the broad range of 2.0

6.0

we have observed that the reduced first cumulant [

* =

(

)/(

)] does not display an asymptotic behavior. Whereas

a better asymptotic behavior is observed by plotting

(

versus

. For the first time

our observation provides direct evidence supporting that

for hyperbranching cluster system with low polydispersity and high local chain segment density

the hydrodynamic interaction is greatly weakened due to the enhanced hydrodynamic shielding effect.

关键词

Keywords

references

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